Rotor Open Or Short Circuit Test
NOTE:
Digital ohmmeter CANNOT be used for the following test.
- Remove rotor from alternator. Set ohmmeter on "x1" scale. Contact each probe to rotor slip ring. Reading should be 2.3-2.5 ohms. A higher resistance reading indicates damaged slip ring solder connection or broken wire.
- A lower reading indicates a shorted wire or slip ring. Replace rotor if damaged. Contact one ohmmeter probe to slip ring and other probe to rotor shaft.
- Ohmmeter reading should be infinity. A reading other than infinity indicates rotor is shorted to shaft and must be replaced. Damaged slip ring terminals or solder touching rotor shaft will cause shorted condition.